Manufacture of electrical insulating material.



UNITED STATES Patented November 3, 1903.

PATENT OFFICE.

CARL JUNG AND ADOLF KITTEL, OF VIENNA, AUSTRIA-HUN GARY, ASSIGNORS OFONE-THIRD TO ADOLF BREOHER, OF VIENNA, AUSTRIA-HUNGARY.

MANUFACTURE OF ELECTRICAL INSULATING MATERIAL.

SPECIFICATION formingpart of Letters Patent No. 742,9 7, dated November1903- Application filed April 21, 1900. Serial No. 13,787- (Nospecimens.)

To all whom it Wtay concern:

Be it known that we, CARL J UNG, residing at 77 Schuttelstrasse, ViennaII, and ADOLF KITTEL, residing at 19 Herthergasse, Vienna V,Austria-Hungary, citizens of the Austro- Hungarian Empire, have inventedcertain new and useful Improvements in the Mannfactu re of ElectricalInsulating Material; and we do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

Our invention relates to an improved insulating material and to aprocess of making the same.

Insulating material made in accordance with our invention consists of amixture of casein and suitable oil. The oil may be used in a crude stateor after bleaching the same with sulfuric acid in any well-known way. Wehave found that the most suitable oils for carrying out our inventionare vegetable oils-such, for example, as castor-oil, rapeseed oil, orlinseed-oil.

In carrying out our improved process the casein obtained in anywell-known way from new milk or skim-milk is first brought into acondition which will permit it to be united with the oil by kneading,whereupon the oil is added and kneaded into the casein, so as to producean intimate mixture. The mixture thus obtained may be molded underpressure into the desired form and dried. If desired, the said mixtureof casein and oil may be united with gutta-percha, caoutchouc,orsuitable resinous substances before being pressed into form and dried.Furthermore, to the mixture of casein and oil may be added suitablematerials other than the gums or resins in the same way as is done withthe usual .rubber ware, and, if desired, suitable colorpowder and i thenmixed with 011 in sufficient quantitj to bring the whole mass into adoughy condition, whereupon it may be kneaded, or the fresh casein maybe submitted to pressure in order to remove the water and then kneadedwith oil, or, furthermore, the casein may be dissolved by the use of anysuitable solvent, such as alkali or borax,

the solution being then evaporated until a,

thickened doughy mass is obtained, which is kneaded with the oil, asbefore. As hereinbefore stated, the oil used with the casein may beeither raw or bleached with sulfurous acid, and we have found that theoils best adapted for our purpose are castor-oil, rapeseed oil, andlinseed-oil.

It will be noted that in all the methods of preparing the casein and oilmixture above referred to the casein is brought to a doughy condition,so that it can be kneaded with the oil. The result is that a thoroughlyuniform gelatinous mass is obtained. This gelatinous mass may be thenmolded under pressure into the desired form and finally dried, or, ashas been explained hereinbefore, the said gelatinous mass may be treatedas a substitute for rubber and may be mixed with suitable gums or resinsor other equivalent materials, singly or combined, and may also becolored, if desired, before being molded and dried. Moreover, beforebeing molded into form the said gelatinous mass or its mixture with anyor all of the above-mentioned ingredients may be united with a suitableamount of sulfur, whereby after molding and drying the composition maybe vulcanized.

As examples of advantageous compositions, in which our casein and oilmixture are used, we give the following formulae, the proportions beinggiven by weight.

I. Five parts of raw gum, five parts of the casein'and oil mixture, onepart of sulfur.

II. Ten parts raw gum, twenty parts of the casein and oil mixture, threeparts sulfur, one part linseed-oil.

III. Fifteen parts raw gum, ten parts of the casein and oil mixture, twoparts sulfur. IV. Ten parts raw gum, fifteen parts of the casein and oilmixture, twenty parts pul .verized gum-waste, one part pitch, ten partssulfur, two parts linseed-oil.

I The various ingredients of the respective formulae above given areunited by thorough mixing and kneading, and the respective compositionsthus obtained may then be brought into suitable form, dried, andvulcanized.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is

1. An insulating material containing a mixture of casein, oil, andsulfur vulcanized.

2. An insulating material containing a mixture of casein, sulfur andbleached vegetable oil Vulcanized.

3. An insulating material containing a mixture of casein, oil, sulfurand gum vulcanized. g

4:. An insulating material containing a mixture of casein, oil, gum orresinous material and sulfur vulcanized.

5. An insulating material containing a mixture of casein, bleached oil,gum or resinou material and sulfur Vulcanized.

6. An insulating material containing a mixture of casein, oil, gum orresinous material, sulfur and coloring-matter vulcanized.

7. The process of making insulating material which consists in firstproducinga doughy mass of casein, then kneading the same with oil, thenadding suitable materials thereto, and next molding and drying the mass,and finally vulcanizing it.

8. The process of making insulating material, which consists in firstproducing a doughy mass of casein, then kneading the same with oil, thenadding gum and other suitable materials thereto, next molding and dryingthe mass, and finally vulcanizing it.

9. The process of making insulating material which consists in producinga doughy mass of casein, then kneading the same with oil, then addinggum or resin and coloringmatter thereto, next molding and drying themass and finally vulcanizing it.

In testimony whereof we have affixed our signatures in presence of twowitnesses.

CARL J UNG. ADOLF KITTEL,

Witnesses:

ALVESTO S. IIOGUE, C. F. I-IIRsT.

